<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

</body>
</html><!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>响应式图片相册</title>
    <style>
        div.img {
            border: 1px solid #ccc;
        }

        div.img:hover {
            border: 1px solid #777;
        }

        div.img img {
            width: 100%;
            height: auto;
        }

        div.desc {
            padding: 15px;
            text-align: center;
        }

        * {
            box-sizing: border-box;
        }

        .responsive {
            padding: 0 6px;
            float: left;
            width: 24.99999%;
        }

        @media only screen and (max-width: 700px){
            .responsive {
                width: 49.99999%;
                margin: 6px 0;
            }
        }

        @media only screen and (max-width: 500px){
            .responsive {
                width: 100%;
            }
        }

        .clearfix:after {
            content: "";
            display: table;
            clear: both;
        }
    </style>
</head>
<body>

<h2 style="text-align:center">响应式图片相册</h2>

<div class="responsive">
    <div class="img">
        <a target="_blank" href="http://www.runoob.com/wp-content/uploads/2016/04/img_fjords.jpg">
            <img src="http://www.runoob.com/wp-content/uploads/2016/04/img_fjords.jpg" alt="Trolltunga Norway" width="300" height="200">
        </a>
        <div class="desc">Add a description of the image here</div>
    </div>
</div>


<div class="responsive">
    <div class="img">
        <a target="_blank" href="bcd.jpg">
            <img src="http://www.runoob.com/wp-content/uploads/2016/04/img_forest.jpg" alt="Forest" width="600" height="400">
        </a>
        <div class="desc">Add a description of the image here</div>
    </div>
</div>

<div class="responsive">
    <div class="img">
        <a target="_blank" href="bcd.jpg">
            <img src="http://www.runoob.com/wp-content/uploads/2016/04/img_lights.jpg" alt="Northern Lights" width="600" height="400">
        </a>
        <div class="desc">Add a description of the image here</div>
    </div>
</div>

<div class="responsive">
    <div class="img">
        <a target="_blank" href="bcd.jpg">
            <img src="http://www.runoob.com/wp-content/uploads/2016/04/img_mountains.jpg" alt="Mountains" width="600" height="400">
        </a>
        <div class="desc">Add a description of the image here</div>
    </div>
</div>

<div class="clearfix"></div>

<div style="padding:6px;">

    <h4>重置浏览器大小查看效果</h4>
</div>

</body>
</html>